o_O I like how all you can come up with are cookie-cutter "go die" insults. Never underestimate the power of a little sarcasm to prove a point.
3rd person chase would be cool, but not vital, as mentioned. It'd be really useful as humans, because you could see the alien attacking the guy no matter where the human is facing, etc etc. And it's not like CS trademarked the perspective, there are lots of other games that use it for spectator mode.
In all seriousness, if you consider a perspective to be an immitation of another game, there just isn't much in Tremulous that isn't immitated.